JRH,

Check on the American Single Shot Rifle Association forum: http://www.assra.com

The 38-55 is very popular with single shot target folks. It is considered to be very accurate. They have many loads that they will share with you. I believe there has been some discussion there about the bore variations for this cartridge. Also a lot of information about reforming brass, etc.

You drilling looks very nice. Thanks for posting that auction site.

Pete